write a java program that asks the user to enter username(ignoring the captalization), then ask for the password if the password is correct let him in the app

.  Write a Java program for a Temperature Converter with the following specifications: The program should display a menu as follows:   TEMPERATURE CONVERTER MAIN MENU                               [1] Conversion from Celsius to Fahrenheit                               [2] Conversion from Fahrenheit to Celsius                               [3] Exit                               Choose an option à   Option 1 should ask for a temperature input and convert it to Fahrenheit. Display the converted temperature.  Assume that the user will only input numerical value.   Option 2 should ask for a temperature input and convert it to Celsius. Display the converted temperature.  Assume that the user will only input numerical value.   The program returns to the main menu after each display from the option, and when an invalid input of the option is encountered.   Validate the option input. Only 1, 2 and 3 are acceptable, otherwise, display a message error and return to the main menu.   Exit option…

Prompt the user for a number x and output the sum of all numbers from 1 to x. If the number entered it less than zero, output an error message. Write a code in Java that will result like test case examples .